/
message_ctor.go
53 lines (45 loc) · 1.41 KB
/
message_ctor.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
// Copyright 2018 The LUCI Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package starlarkproto
import (
"sort"
"go.starlark.net/starlark"
)
// messageCtor represents a proto message constructor: it is a callable that
// produces instances of Message.
//
// Instances of messageCtor are created (and put into a module dict) in
// loader.go.
//
// Implements HasAttrs interface. Attributes represent constructors for nested
// messages and values of enums.
type messageCtor struct {
*starlark.Builtin
typ *MessageType
attrs starlark.StringDict
}
func (b *messageCtor) Type() string {
return b.Name()
}
func (b *messageCtor) Attr(name string) (starlark.Value, error) {
return b.attrs[name], nil // (nil, nil) means "not found"
}
func (b *messageCtor) AttrNames() []string {
keys := make([]string, 0, len(b.attrs))
for k := range b.attrs {
keys = append(keys, k)
}
sort.Strings(keys)
return keys
}